[P-EM16] Dynamics of Earth's Inner Magnetosphere and Initial Results from Arase

[PEM16-07] Simultaneous observation of PMWE and plasma waves with PANSY radar and Arase satellite

★Invited Papers

*田中 良昌¹、西山 尚典¹、門倉 昭¹、尾崎 光紀²、塩川 和夫³、堤 雅基¹、片岡 龍峰¹、三好 由純³、大山 伸一郎^3,1,11、松岡 彩子⁴、笠原 禎也²、熊本 篤志⁵、土屋 史紀⁵、吹澤 瑞貴⁵、疋島 充⁴、松田 昇也³、能勢 正仁⁶、長妻 努⁷、西村 耕司¹、佐藤 薫⁸、篠原 学⁹、藤本 晶子¹⁰、寺本 万里子³、野村 麗子⁴、行松 彰¹ (1.国立極地研究所、2.金沢大学、3.名古屋大学宇宙地球環境研究所、4.宇宙航空研究開発機構宇宙科学研究所、5.東北大学、6.京都大学、7.情報通信研究機構、8.東京大学、9.鹿児島工業高等専門学校、10.九州大学、11.オウル大学)

キーワード：極域中間圏冬季エコー、あらせ衛星、コーラス波動、電磁イオンサイクロトロン波、オーロラ、高エネルギー電子降り込み

We investigate Polar Mesosphere Winter Echoes (PMWE) accompanied by an isolated substorm around 04 UT on March 21, 2017, which occurred during the passage of corotating interaction region (CIR). Various phenomena associated with the substorm were detected by the coordinated observation with ground-based instruments at Syowa station (SYO), Antarctica, and its geomagnetic conjugate station, Husafell (HUS), Iceland, and Arase (ERG) satellite whose footprints were located close to SYO and HUS. PMWE was observed at 65-80 km altitude with Program of the Antarctic Syowa Mesosphere, Stratosphere and Troposphere/Incoherent Scatter (PANSY) radar at SYO and appeared to be related to the substorm. This implies that the electron density enhancement in the mesosphere due to high-energy electron precipitation during the substorm is one of the important factors causing PMWE. Such an existence of energetic electron precipitation was supported by the simultaneous observation of cosmic noise absorption (CNA) with riometer and backscatter echo from 55-70 km with medium frequency (MF) radar. During this interval, whistler-mode chorus waves and electromagnetic ion cyclotron (EMIC) waves were observed near the magnetic equator in the morning side magnetosphere by Arase. In this study we compared PMWE with the whistler-mode chorus waves and EMIC waves simultaneously observed in the magnetosphere for the first time. The results suggest that the whistler-mode chorus waves and EMIC waves are possible candidates for driver of energetic electron precipitation that causes PMWE.